Allometry

Allometry is the study of how one size variable scales against the other. Typically methods related to principal components are used for analysis, although in low dimensions (usually 2-3D), and with the primary focus being inference about model coefficients rather than data reduction. Two problems yet to be adequately addressed in the literature: how to make inferences about allometric lines whose coefficients are a function of continuous covariates; how to generalise inferential methods to relax the independence assumption across points to handle phylogenetic relationships between variables.

Software for bivariate line-fitting in allometry.

smatr version 3 is available as an R package from CRAN.

Or try (S)MATR as an executable file written by Dan Falster. This comes with a helpful user's guide.